Not an expert opinion, but these all seem like they do or return
something that some application might be interested in (though some
not so likely as others), and should likely be retained:

  #addAlarm:after: #addAlarm:at: #addAlarm:with:at:
  #addAlarm:with:with:after: #addAlarm:with:with:at: #adjustedCenter:
  #balloonColor: #bottomRight: #bounds:from: #completeModificationHash
  #disableGestures #fullLoadCachedState #embedInto: #removeAlarm:at:
  #removeLink: #setProperties: #withAllOwners #morphsInFrontOverlapping:
  #structureString #submorphBefore #submorphWithProperty:

These all look like leftover bits of old code, at one time used by the
library, but no more:

  #isModalShell #doesOwnRotation #dragSelectionColor #dropSuccessColor
  #hasReferencedGestureDictionary #isBalloonHelp #rootAt:
  #screenLocation #slotSpecifications #textToPaste #transportedMorph
  #wantsEveryMouseMove

I would guess that these all fall in that category, too, but I'm not
at all certain:

  #inspectArgumentsPlayerInMorphic: #inspectInMorphic
  #moveWithPenDownByRAA: #nameInModel #okayToExtractEasily
  #specialNameInModel #updateAllScriptingElements
  #altSpecialCursor0 #altSpecialCursor1 #altSpecialCursor2
  #altSpecialCursor3 #isSteppingSelector: #morphReport
  #constructorString #imageFormWithout:andStopThere:
  #rootMorphsAtGlobal:

#privateFullBounds: appears to have been ignored in favor of accessing
the fullBounds ivar directly.

-Jesse